Intelligent double-fan-coil control panel

Abstract

The utility model discloses a kind of intelligent double-fan coil control panel, it is related to frequency conversion fan control technical field, the control panel includes control circuit, the control circuit includes: single-chip microcontroller, including communication chip;Power supply circuit, including buck chip, the buck chip is used to output 15V, 12V, 5V direct current voltage and 12V direct current voltage output to relay;Storage circuit, including storage chip;IPM module, including temperature acquisition circuit and overload protection circuit;Needle holder FAN1, FAN2, connection end is connected with drive circuit and double fan, and drive circuit is adjusted according to the control signal output by single-chip microcontroller, the current and voltage input to fan motor.The intelligent double-fan coil control panel, drive circuit is designed on control panel, the drive circuit can receive the control signal from single-chip microcontroller, and then the current and voltage input to fan motor are adjusted, realize the speed-regulating function of fan.

Description

Technical Field

[0001] This utility model relates to the field of variable frequency fan control technology, specifically to an intelligent dual fan coil control board. Background Technology

[0002] In today's era of pursuing efficiency, intelligence, and health, the HVAC equipment industry is undergoing profound changes. Traditional fan coil unit control boards can no longer meet the increasingly diverse needs of users in terms of functionality and performance. Therefore, the development of intelligent dual fan coil unit control boards has important practical significance.

[0003] From an energy conservation perspective, with the continuous rise in global energy costs and the urgent need for energy conservation and emission reduction, building energy consumption has become a focus of attention. Building energy consumption accounts for nearly 40% of global total energy consumption, of which air conditioning system energy consumption accounts for a large proportion. According to relevant research, air conditioning systems using intelligent temperature control technology can save 20%-30% more energy than traditional systems, which is of great significance for reducing building energy consumption and achieving sustainable development.

[0004] Most of the existing dual fan coil unit control boards on the market have the following drawbacks:

[0005] 1. Because the existing dual fan coil control board does not have a corresponding drive circuit, the dual fan coil unit cannot achieve the function of stepless speed regulation.

[0006] 2. In practical applications, the air volume of dual fan coil units needs to be adjusted according to user needs, but existing dual fan coil units cannot meet this user need.

[0007] 3. To facilitate debugging, some important parameters (such as fan operating frequency) are usually pre-written into the control board of the dual fan coil unit. However, this approach is not flexible. Once there is a new requirement, the program needs to be re-burned, which is cumbersome and inefficient. Utility Model Content

[0008] The purpose of this invention is to provide an intelligent dual fan coil control board to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following technical solution: an intelligent dual-fan coil control board, the control board including a control circuit, the control circuit including: a microcontroller, including a communication chip; a power supply circuit, including a step-down chip, the step-down chip being used to output 15V, 12V, and 5V DC voltages, with the 12V DC voltage output to a relay; a storage circuit, including a storage chip; an IPM module, including a temperature acquisition circuit and an overload protection circuit; and pin headers FAN1 and FAN2, the connection terminals of which are connected to the drive circuit and the dual fans.

[0010] Furthermore, the drive circuit adjusts the current and voltage input to the fan motor based on the control signal output by the microcontroller.

[0011] Furthermore, the drive circuit employs pulse width modulation (PWM) technology, which controls the motor's input voltage by changing the duty cycle of the PWM signal, thereby adjusting the motor speed.

[0012] Furthermore, the drive circuit has overcurrent protection and short-circuit protection functions. When an abnormal current is detected, the power supply to the fan is cut off in time to protect the fan and drive circuit from damage.

[0013] Furthermore, terminal CN7 controls the high, medium, and low speed adjustment of the motor. Terminal CN7 is a multi-pin connector, with different pins connected to the high, medium, and low speed control circuits of the motor.

[0014] Furthermore, the microcontroller adjusts the motor speed by controlling the level state of the corresponding pins based on the received control commands or the preset operating mode.

[0015] Furthermore, DIP switches SW1 and SW2 are used to transmit the fan setting parameters to the microcontroller. DIP switches SW1 and SW2 are mechanical DIP switches.

[0016] Furthermore, each DIP switch can be set to multiple different states, allowing for the setting of various fan parameters through different combinations. Additionally, the control board includes a protection circuit for overload protection of the entire circuit.

[0017] This utility model provides an intelligent dual fan coil unit control board with the following advantages: A drive circuit is designed on the control board, which can receive control signals from a microcontroller and adjust the current and voltage input to the fan motor to achieve fan speed regulation. The drive circuit can also have other protection functions, such as overcurrent protection and short-circuit protection, so that the power supply to the fan can be cut off in time in case of abnormal conditions, ensuring the stability and safety of the system. In addition, the control board is equipped with a DIP switch, which allows various parameters to be set by toggling the switch, making debugging more convenient and efficient. This not only achieves stepless speed regulation but also improves the system's flexibility and maintainability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the circuit principle of the first part of this utility model;

[0019] Figure 2 This is a schematic diagram of the circuit principle of the second part of this utility model;

[0020] Figure 3This is a schematic diagram of the circuit principle of the third part of this utility model;

[0021] Figure 4 This is a schematic diagram of the circuit principle of the fourth part of this utility model. Detailed Implementation

[0022] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0023] like Figures 1 to 4 As shown, an intelligent dual fan coil unit control board includes a control circuit, which includes:

[0024] Microcontrollers, including communication chips;

[0025] The power supply circuit, including the step-down chip, is mainly used to output 15V, 12V, and 5V DC voltages, with the 12V DC voltage output to the relay.

[0026] Storage circuits, including storage chips;

[0027] The IPM module includes a temperature acquisition circuit and an overload protection circuit.

[0028] Pin sockets FAN1 and FAN2 connect to the drive circuit and the dual fans. High-quality connectors are used in FAN1 and FAN2 to ensure reliable connection to the fan motors. The drive circuit adjusts the current and voltage input to the fan motors based on the control signal output from the microcontroller, thus achieving fan speed regulation. The drive circuit can use pulse width modulation (PWM) technology to control the motor's input voltage by changing the duty cycle of the PWM signal, thereby adjusting the motor speed. Simultaneously, the drive circuit also features overcurrent protection and short-circuit protection. When abnormal current is detected, it promptly cuts off the power supply to the fan, protecting the fan and drive circuit from damage.

[0029] Terminal CN7 controls the high, medium, and low speed adjustment of the motor. Terminal CN7 is a multi-pin connector, with different pins connected to the high, medium, and low speed control circuits of the motor. The microcontroller adjusts the motor speed by controlling the level state of the corresponding pins according to the received control command or the preset operating mode. For example, when the motor needs to run at high speed, the microcontroller will output a high level on the corresponding high-speed control pin and output a low level on other pins, so that the motor switches to high-speed operation.

[0030] DIP switches SW1 and SW2 are used to transmit fan setting parameters to the microcontroller. SW1 and SW2 are mechanical DIP switches, offering good tactile feedback and stability. Each switch can be set to multiple different states, allowing for the setting of various fan parameters through different combinations. For example, SW1 can be used to set the fan's operating mode (such as manual mode, automatic mode, etc.), while SW2 can be used to set the fan's timer or wind speed level. The microcontroller periodically scans the states of the DIP switches to obtain the setting parameters and adjusts the control strategy accordingly.

[0031] This embodiment provides an intelligent dual-fan coil unit control board, which has a protection circuit, a drive circuit, and a feedback speed regulation circuit. At startup, 220V AC mains power is connected to the circuit, passing through a transformer and rectifier bridge before entering the step-down chip. The step-down chip processes the voltage to output 15V, 12V, and 5V DC voltages. The 12V DC voltage is output to two relays; the first relay is engaged, while the second is not. The 220V AC power passes through a thermistor starter. After a few seconds, the second relay engages, and the AC power, after passing through the rectifier bridge, outputs 310V DC voltage. At this point, the power supply circuit is complete, and the IPM module receives power to drive the fan. The fan is connected to the control board via pin headers FAN1 and FAN2. The IPM module receives six drive signals from the microcontroller and controls the three-phase current of the fan motor through its built-in drive circuit, adjusting the fan speed. This speed regulation allows the fan to quickly and stably reach the set temperature value. Once the set temperature is reached, the fan can continuously reduce its speed to a certain level, thereby stabilizing the set temperature, reducing noise and improving comfort.

[0032] The power supply circuit also includes a transformer and a rectifier bridge. The transformer and rectifier bridge are used to supply AC power to the step-down chip. The rectifier bridge converts AC power to DC power. The transformer and rectifier bridge process the AC power supplied to the step-down chip. The power supply circuit also includes a thermistor starter and a rectifier bridge. The circuit inputs a 310V high-voltage current into the IPM module. The first and second relays are used for automatic adjustment, safety protection, and switching circuits. The power supply circuit also includes a thermistor starter, a rectifier bridge, and a voltage regulator. The power supply circuit drives the fan. The thermistor starter provides overheat protection in the power supply circuit. The microcontroller also includes a control chip, a decoding chip, and a data processing module. The microcontroller is used for data transmission and speed command decoding. This microcontroller integrates functions such as speed command decoding, speed feedback calculation, and precise acceleration / deceleration control. It also provides overload protection for the entire circuit during startup to prevent damage from excessive voltage. The system boasts high integration and excellent control performance. Two fans are configured, each connected to a drive circuit via pin headers FAN1 and FAN2. Terminal CN7 is used to select high, medium, and low speeds, sending signals to the microcontroller to adjust the motor speed. DIP switches SW1 and SW2 select different speed groups, each corresponding to a different fan setting. Other operating parameters, such as fan operating time and wind speed mode, can also be set via DIP switches. Each DIP switch position represents a specific parameter option. The temperature acquisition circuit in the IPM module detects the module's temperature; if the temperature exceeds the safe range, it triggers protection measures to prevent overheating and damage. Furthermore, the temperature acquisition circuit can detect temperature changes in a timely manner and provide feedback signals to adjust power output. The overload protection circuit detects current to prevent fan overload operation, protecting the motor and drive module.

[0033] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An intelligent dual fan coil unit control board, characterized in that, The control board includes a control circuit, which comprises: a microcontroller, including a communication chip; a power supply circuit, including a step-down chip, which outputs 15V, 12V, and 5V DC voltages, with the 12V DC voltage output to the relay; a storage circuit, including a storage chip; an IPM module, including a temperature acquisition circuit and an overload protection circuit; and pin headers FAN1 and FAN2, whose connection terminals are connected to the drive circuit and the dual fans.

2. The intelligent dual fan coil unit control board according to claim 1, characterized in that, The drive circuit adjusts the current and voltage input to the fan motor based on the control signal output by the microcontroller.

3. The intelligent dual fan coil unit control board according to claim 2, characterized in that, The drive circuit uses pulse width modulation (PWM) technology to control the motor's input voltage by changing the duty cycle of the PWM signal, thereby adjusting the motor speed.

4. The intelligent dual fan coil unit control board according to claim 3, characterized in that, The drive circuit has overcurrent protection and short circuit protection functions. When an abnormal current is detected, the power supply to the fan is cut off in time to protect the fan and drive circuit from damage.

5. The intelligent dual fan coil unit control board according to claim 4, characterized in that, Terminal CN7 controls the high, medium, and low speed adjustment of the motor. Terminal CN7 is a multi-pin connector, with different pins connected to the high, medium, and low speed control circuits of the motor.

6. The intelligent dual fan coil unit control board according to claim 5, characterized in that, The microcontroller adjusts the motor speed by controlling the level state of the corresponding pins according to the received control commands or the preset operating mode.

7. The intelligent dual fan coil unit control board according to claim 6, characterized in that, DIP switches SW1 and SW2 are used to transmit the fan setting parameters to the microcontroller. DIP switches SW1 and SW2 are mechanical DIP switches.

8. The intelligent dual fan coil unit control board according to claim 7, characterized in that, Each DIP switch can be set to multiple different states, and various parameters of the fan can be set through different combinations.

9. The intelligent dual fan coil unit control board according to claim 8, characterized in that, The control board also includes a protection circuit for overload protection of the entire circuit.

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